David, my comment was to the OP, who wrote ...
Was my father content reading the same cowboy books over and over? He did spend a lot of time finding fault with the world. I would not have called him a contented man. This was a highly successful and creative architect in his day. Earlier, he had been a Rhodes Scholar. He did not stop because he wanted to - everyone has a life span, and the younger generation went to younger architects. Work/expression for him was all or nothing, and in the end it was nothing.
My advice is that, if one's life work is coming to an end, seek a new path for one's juices. It can be an extension of what is, it can be a new development of what was, or it can be the continuation of a hobby already there.
Regards from Perth
Derek
Derek, you will know much more about what makes people unhappy than not, and if no good information is known about a particular case, what the odds are.
I couldn't glean from your post whether or not your father was happy, but you've illuminated that. My grandfather on my dad's side held political office as well as a few management jobs at defense contractors (a feat for a man with 9 kids at home and a wife who was off her rocker - she was a sweet woman, but crippled by worry her entire life).
I think it's popular to find fault with the world these days, and it's a trap that robs us of being happy with what's right in front of us. As you described your dad unaware of what's going on outside of his bubble - sometimes that's happiness, and sometimes it's a recipe for discontent due to lack of familiarity with what you're angry about - or realistic expectations).
My grandfathers in both cases moved into their own bubbles - the paper told them enough about the rest of their world and they had the opposite reaction - they were entitled to live in their bubble and be pleased.
It's hard to know what'll make someone go. Both of my grandfathers worked like bonkers when they were in the "main sequence" of their lives, they were born in a time when you were to fear idle time and knew your days were limited. 20-25 hours a week of firewood cutting for my mother's father was more or less 1/3rd time or less vs. his working life.
We're PA germans, so the notions may be different than yours. If you "push the plow" as your dad did until he's 71, then expectations from others can blow away like a fart in the wind if someone else doesn't like it, and then happiness and contentment is really the only question. Some of our friends come with more family involvement, and when someone retires (Especially if involuntarily eliminated from a corporate position), then they often feel pressure to keep performing for other people. I think that's sad (actually, it's pitiful)
unless that's what makes said person happy.
Viewing through the lens of a PA dutchy background, post-retirement meddling in the younger generation's business would be considered shameful, and leaving an egg for the next generation obligatory. Mother's father left us abruptly (literally while eating lunch at 79 between cutting trees). Her mother let us know they wouldn't have done a thing different, fought until her second to last day, and one evening said "i'm ready to go" and was gone within hours. They bristled at anyone else's expectations of them above and beyond family obligations.
I've heard a term for this. "downrounding". "Yes, your grandfather was the hardest worker I ever met. But I have no idea why he wasted his retirement cutting and splitting firewood. what a waste. When I was a kid, he had 15 hands and could've built an empire if he'd have kept going. He should have _____ and would've done better if he wasn't so stubborn".
He was confident enough to dismiss them.
But whether or not it's achievement or lack of it, he knew exactly what he wanted to do in retirement - that part was, as you say, worked into in stages.
I find the people who get canned from private jobs and still have their motor running (thus they slid into volunteer positions and make things difficult for everyone else, stirring up trouble, refusing to sit and watch for a while but rather trying to unseat everyone and everything) far worse than those who flip off the switch.